One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,3,4)(6,9)(7,11)(13,14)(15,24)(16,20)(17,21)(18,22)(19,23)(25,28)(26,27)(1,2)(3,4)(5,6)(7,10)(8,9)(11,12)(13,15,19,21)(14,17,23,24)(16,26,18,25)(20,28,22,27)(5,7,8,11)(6,10,9,12)(13,16,19,18)(14,20,23,22)(15,25,21,26)(17,27,24,28)(13,14)(15,17)(16,20)(18,22)(19,23)(21,24)(25,27)(26,28) involution — undirected(13,17)(14,21)(15,23)(16,27)(18,28)(19,24)(20,26)(22,25) involution — undirected(13,18,19,16)(14,22,23,20)(15,26,21,25)(17,28,24,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.